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(No Model.)

- J. P. KESTER.

GOMMUTATOR BRUSH.

Patented Feb. 6, 1894;

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no: NATIONAL umoemmme ccmlrA Nn UNITED STATES PATENT OFFICE.

JESSE F. KESTER, OF BUFFALO, NEW YORK, ASSIGNOR TO THE F. P. LITTLEELECTRICAL CONSTRUCTION AND SUPPLY COMPANY, OF SAME PLACE.

COMMUTATOR-BRUSH.

SPECIFICATION forming part of Letters Patent No. 514,150, dated February6, 1894.

Application filed November 23, 1893- Serial No. 491,701. (No model.)

To all whom, it may concern.-

Be it known that I, JESSE F. KESTER, a citizen of the United States,residing at Buffalo, in the county of Erie and State of New York, haveinvented new and useful Improvements n Oommutator-Brushes, of which thefollowmg is a specification.

This invention relates to a composite commutator brush for electricdynamos and motors and has the object to provide a lubricafor leaf orlayer for these brushes which is simple, efiicient and inexpensive inconstruc- In the accompanying drawings:-Figure 1 is a perspective viewof a commutator brush embodying my invention. Fig. 2 is a top plan viewof one of the lubricator leaves of the brush, a portion of its coveringbeing broken away. Fig. 3 is a fragmentary cross section, on an enlargedscale, of one of the lubricator leaves of the brush. Figs. 4 and 5 arelongitudinal sections, showing modified constructions of the lubricatorleaves. Figs. 6 and 7 are perspective views showing my invention appliedto pencil brushes.

Like letters of reference refer to like parts in the several figures.

Referring to Figs. 1, 2 and 3, A represents a rectangular sheet or layerof wire gauze, preferably copper, the meshes or interstices of which arefilled with a solid lubricating material a forming a lubricator leaf. Inbuilding up a commutator brush embodying my invention, one of theselubricator leaves is placed at intervals between the ordinary plateleaves a of the brush, as represented in Fig. 1, the number oflubricator leaves be ing governed by the amount of lubricationnecessary. The rotation of the commutator against the brush wears theends of the plate and gauze leaves and heats the same sufficiently todissolve the lubricating material in the meshes of the gauze leaves,thereby lubricating the commutator, and preventing excessive heating andavoiding sparking. The wires of the lubricator leaves are preferablyarranged diagonally, as shown in Fig. 2, so that they are worn ofi attheir ends. In

order to confine the lubricating material in the meshes of the gauzeleaf the surface of contain the necessary recesses or interstices forreceiving the lubricating material.

When it is desired to lubricate a brush which is made in the shape of apencil E one of my improved lubricating leaves is wrapped around thesame, as represented in Fig. 6, or if desired, the pencil can be madewholly from a lubricator leaf by rolling the latter into the shape of apencil, as represented in Fig. 7.

Although the interstices in the lubricating leaves may be filled withvarious kinds of lubricating material having the necessary solodity, Iprefer to use a compound which is composed principally of beeswax,prepared as follows:fifty parts of beeswax, fifteen parts of spermaceti,ten parts of stearic acid are melted together and mixed with twenty-fiveparts of powdered graphite. WVhile in a liquid state, this mixture isbrushed into the interstices of the lubricator leaves, the action of thestearic acid soon hardening the compound.

I claim as my invention-- 1. Alubricator leaf for commutator brushesprovided with interstices filled with lubricating material and anelectro coating deposited on the surface of said leaf, substantially asset forth.

2. Alubricatorleaf forcommutatorbrushes provided with interstices filledwith a lubricatin g material composed principally of bees- Wax,substantially as set forth.

3. A lubricator leaf for commutator brushes provided with intersticesfilled with a lubricating material composed of beeswax, spermaceti,graphite and stearic acid, substantially as set forth.

Witness my hand this 27th day of Septem ber, 1893.

JESSE F. KESTER. Witnesses:

THEo. L. PoPP, J No. J. BONHEB.

